how long do you flood your table for?

For over a century every 6 hours I would flood and drain my rockwool half way up the cube.
Rains around the world at all times.
Enjoy and good luck with your grow.
 
I used to flood every 3 hours during lights on for roughly 15 minutes each time.
 
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some say 15 minutes after lights come on and 15 minutes before lights go off. what are your tables running at?
I have an ebb and flow table with a cover that has holes cut in it for the 8 inch net pots. The pots are suspended into the ebb table through the holes as well as the roots once they are established. I flood once every hour 24 times a day since for 15 minutes. It’s like nft the way its setup.
 
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